Production method for low acid consumption and corrosion resistant hot-rolled pickling product

Abstract

The invention relates to a production method for a low acid consumption and corrosion resistant hot-rolled pickling product. The method specifically includes the steps of: performing uncoiling by an uncoiler; breaking and peeling oxides on a strip steel surface by a levelling machine; further breaking and peeling the oxides on the strip steel surface by a multi-roll straightener; clearing the shedding and loose oxides from the strip steel surface by a brushing device; carrying out pickling and rinsing on the treated strip steel; then clearing residue on the strip steel surface by a mechanical means; and performing reeling by a reeling machine. The technical scheme involved in the invention has the advantages that: 1. oxide cracks on the strip steel surface are numerous and have large gaps, thus facilitating fast penetration of an acid liquid, and the pickling efficiency is high; 2. at the same time of breaking phosphorus, part of the oxides can be removed, the pickling reaction dose is reduced, and the acid consumption is low; 3. after processing, the strip steel yield strength added value is low, and the strip properties are almost not affected; 4. leveling processing eliminates the yield platform of strip steel, and the formation of a Luders band on an ordinary hot-rolled product surface can be avoided; and 5. chlorine ion residue on the product surface is reduced, and the product has good corrosion resistance.

Description

technical field [0001] The invention belongs to the field of deep processing of ordinary hot-rolled flat materials, and in particular relates to a production method of low-acid-consumption, corrosion-resistant, hot-rolled pickled products. Background technique [0002] In the existing technology, such as figure 1 As shown, the traditional pickling unit consists of an uncoiler 1, an inlet looper 2, a tension leveler 3, pickling 4, a rinse 30, an exit looper 5, and a coiler 6. The tension leveler 3 is configured at the entrance for mechanical breaking Phosphorus, after the phosphorus is broken, the strip steel becomes a hot-rolled pickling product after pickling 4 and rinsing for 20 minutes. This production process has the following defects. The unsatisfactory phosphorus breaking effect leads to low pickling efficiency; Seriously, reduce the corrosion resistance of the product. [0003] Such as figure 2 As shown, the main reason for the low efficiency and high acid consump...

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Problems solved by technology

[0006] In order to reduce acid residue, the strip steel 7 is traditionally cleaned by multi-stage rinsing 30 , and the temperature of rinsing 30 is continuously raised during the rinsing 30 , increasing the kinetic energy of molecules in the rinsing 30 tank, and accelerating the diffusion of acid solution. Generally, the last stage rinsing 30 The rinsing temperature is about 85°C, which increases the energy consumption of the production process. Even so, from the actual production situation, the acid concentration in the final rinse 30 tank is still 100mg / l-150mg / l

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